1/* $NetBSD: cpufeature.h,v 1.9 2021/12/19 11:52:47 riastradh Exp $ */ 2 3/*- 4 * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Taylor R. Campbell. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32#ifndef _LINUX_ASM_CPUFEATURE_H_ 33#define _LINUX_ASM_CPUFEATURE_H_ 34 35#include <sys/cpu.h> 36 37#if defined(__i386__) || defined(__x86_64__) 38 39#include <x86/specialreg.h> 40 41#define cpu_has_clflush ((cpu_info_primary.ci_feat_val[0] & CPUID_CLFSH) != 0) 42#define cpu_has_pat ((cpu_info_primary.ci_feat_val[0] & CPUID_PAT) != 0) 43 44#define X86_FEATURE_CLFLUSH 0 45#define X86_FEATURE_PAT 1 46 47static inline bool 48static_cpu_has(int feature) 49{ 50 switch (feature) { 51 case X86_FEATURE_CLFLUSH: 52 return cpu_has_clflush; 53 case X86_FEATURE_PAT: 54 return cpu_has_pat; 55 default: 56 return false; 57 } 58} 59 60#define boot_cpu_has static_cpu_has 61 62static inline size_t 63cache_line_size(void) 64{ 65 return cpu_info_primary.ci_cflush_lsize; 66} 67 68static inline void 69clflush(const void *p) 70{ 71 asm volatile ("clflush %0" : : "m" (*(const char *)p)); 72} 73 74#endif /* x86 */ 75 76#endif /* _LINUX_ASM_CPUFEATURE_H_ */ 77